Question 475352
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Write each one on paper and turn the paper upside down.

A)81 becomes 18 when turned upside-down, and decreases by 63, not by 12

B)69 stays 69, and neither decreases nor increases, so it doesn't decrease by 12

C)16  becomes 91 when turned upside-down, and increases by 75, it doesn't decrease by 12

D)98 becomes 86 when turned upside-down, and decreases by 12.  So D) is the answer.

Edwin</pre>